Aircraft equipment problem radio lost communication after takeoff returned to land.

Attributes
ACN	286197
Time
Date	199410
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : den
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 18000 flight time type : 10000
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After takeoff, all communication reception was lost. All attempts to restore contact were unsuccessful including 1) circuit breaker check 2) switching to #2 communication after removing hand mikes from plugs. 3) tweaking pickle switch. 4) testing squelch on both communications. 5) transmitting in the blind and listening on all navigation radios and ADF at full volume with each microphone independently. The flight was kept in VFR conditions and 7700 and 7600 were on the squawk at the appropriate times. Takeoff was on runway 35L and return was on runway 26L. A wide pattern was flown for ATC considerations. The tower flashed a green light on base leg followed by a continuous a final. At touchdown, loud static was heard on headsets and speakers and communication were restored. Afterwards, a call was made to the tower, and it was found that all emergency transmitters for navigation and ADF had been moved to dia much to the disgust of the tower chief. Had this failure occurred during WX or high traffic volume, I feel this could be a potential safety issue. At least 1 means of radio transmitter needs to be available for this case scenario until the move to dia is complete. Stapleton is still operational and needs the safety backup.

Original NASA ASRS Text

Title: ACFT EQUIP PROB RADIO LOST COM AFTER TKOF RETURNED TO LAND.

Narrative: AFTER TKOF, ALL COM RECEPTION WAS LOST. ALL ATTEMPTS TO RESTORE CONTACT WERE UNSUCCESSFUL INCLUDING 1) CIRCUIT BREAKER CHK 2) SWITCHING TO #2 COM AFTER REMOVING HAND MIKES FROM PLUGS. 3) TWEAKING PICKLE SWITCH. 4) TESTING SQUELCH ON BOTH COMS. 5) XMITTING IN THE BLIND AND LISTENING ON ALL NAV RADIOS AND ADF AT FULL VOLUME WITH EACH MIKE INDEPENDENTLY. THE FLT WAS KEPT IN VFR CONDITIONS AND 7700 AND 7600 WERE ON THE SQUAWK AT THE APPROPRIATE TIMES. TKOF WAS ON RWY 35L AND RETURN WAS ON RWY 26L. A WIDE PATTERN WAS FLOWN FOR ATC CONSIDERATIONS. THE TWR FLASHED A GREEN LIGHT ON BASE LEG FOLLOWED BY A CONTINUOUS A FINAL. AT TOUCHDOWN, LOUD STATIC WAS HEARD ON HEADSETS AND SPEAKERS AND COM WERE RESTORED. AFTERWARDS, A CALL WAS MADE TO THE TWR, AND IT WAS FOUND THAT ALL EMER XMITTERS FOR NAV AND ADF HAD BEEN MOVED TO DIA MUCH TO THE DISGUST OF THE TWR CHIEF. HAD THIS FAILURE OCCURRED DURING WX OR HIGH TFC VOLUME, I FEEL THIS COULD BE A POTENTIAL SAFETY ISSUE. AT LEAST 1 MEANS OF RADIO XMITTER NEEDS TO BE AVAILABLE FOR THIS CASE SCENARIO UNTIL THE MOVE TO DIA IS COMPLETE. STAPLETON IS STILL OPERATIONAL AND NEEDS THE SAFETY BACKUP.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.